Electric fan



FIG. 1 is a perspective view of the claimed design;

FIG. 2 is a front view of the claimed design;

FIG. 3 is a rear view of the claimed design;

FIG. 4 is a left side view of the claimed design;

FIG. 5 is a right side view of the claimed design;

FIG. 6 is a top plan view of the claimed design; and,

FIG. 7 is a bottom plan view of the claimed design.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for an electric fan, as shown and described. 